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Finding the Fourth Proportional to 128,124.20, 191,927.10 and 72,655.40

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Solution

The fourth proportional to 128,124.20, 191,927.10 and 72,655.40 is: 108,836.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,124.20 : 191,927.10 = 72,655.40 : x
  2. Step 2: Convert to fraction form
    128,124.20/191,927.10 = 72,655.40/x
  3. Step 3: Cross multiply
    128,124.20x = 191,927.10 × 72,655.40
  4. Step 4: Simplify right side
    128,124.20x = 13,944,540,221.34
  5. Step 5: Solve for x
    x = 13,944,540,221.34/128,124.20
  6. Step 6: Final answer
    x = 108,836.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.